I've been telling people about the Anime "Ghost in the Shell" for years, because I think this is more likely to happen first: Augmented Humans.
We'll have feet and hands, followed by arms and legs, leading up to organs and eventually e-brains (network connectivity, SSD, etc), eye inserts (optical zoom and macro abilities), and who knows what else? But the series has a catch, no more than 2 people in the entire world have full cyborg bodies because you can't just drop anyone in a full cyborg machine.
The Japanese provide the high quality augmentations, while the Chinese have the low quality parts that don't work very well, last long, and are prone to be hacked.
Now with that being said, I would find it hard to imagine "that a person can be preserved." Think of explaining what a person is to a computer - you may never finish the task, such as explaining what color is to a person who's been blind since birth. Because we're not just constructs of memory that recall to produce a real time interface, but rather a complex array of sensors and output that interacts in an environment that is difficult to describe - just to name a few things. You can do a lot of things, and maybe one day create a real life simulacrum but will it be able to perceive that you are sad or happy? Will it understand what your emotions mean as it interacts with you?
I kinda think of it like the writers from the Robocop series did, not everyone is cut out to be a brain in a robotic suit with weapons, you might just spaz out and shoot others or yourself to end the misery.